Technique to enhance the electro-optic coefficient of polymers by using a sol-gel cladding layer to increase poling efficiency
a technology of electro-optic coefficient and sol-gel cladding layer, which is applied in the field of electro-optic materials, can solve the problems of limited eo coefficients that can be achieved by poling, and achieve the effects of reducing the operating voltage of eo devices, preventing dielectric breakdown, and low optical loss
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example 1
[0049]The electro-optic coefficients of a control group of samples without a cladding layer were compared to those of group of samples that included a sol-gel cladding layer.
[0050]The control group samples were made by spin-coating a 1 μm layer of AJL8 / APC polymer (i.e., AJL8 chromophore doped into an amorphous polycarbonate) onto an ITO / glass substrate and then baking at 80° C. for 12 hours in a vacuum oven. A top 100 nm Au electrode was then deposited by electron beam evaporation.
[0051]The cladding samples were made by spin coating a 5 μm sol-gel layer of a 95 / 5 molar ratio of methacryloyloxy propyltrimethoxysilane to zirconium(IV)-n-propoxide onto an ITO / glass substrate and then hard baking at 150° C. for 1.5 hours. A 1 μm AJL8 / APC polymer layer was then spin-coated onto the sol-gel layer and baked at 80° C. for 12 hours in a vacuum oven. A top 100 nm Au electrode was then deposited by electron beam evaporation.
[0052]The samples were contact poled at a series of voltages for 3 mi...
example 2
[0054]The electro-optic coefficients of samples without a cladding layer were compared to those of samples that included a sol-gel cladding layer.
[0055]The sol-gel cladding used in the experiments was a 95 / 5 molar ratio of 3-(trimethoxysilyl)propyl methacrylate to zirconium(IV)-n-propoxide. The solution was hydrolyzed with 0.1 N HCl and spin coated onto indium tin oxide (ITO)-coated glass substrates and baked at 150° C. for 1.5 hrs. The two guest-host EO polymer systems used were AJL8 chromophore doped into amorphous polycarbonate (APC) and JT1 chromophore doped into a polyimide (PI). The polymers were spin coated onto both ITO glass substrates and sol-gel coated ITO glass substrates to a thickness of 1 μm and baked in a vacuum oven for 12 hrs at 85° C. Gold top electrodes were deposited by electron beam evaporation to a thickness of 100 nm.
[0056]In order to obtain an estimate of the fraction of the total applied voltage dropped across the EO polymer layer, current density was measu...
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